Mojave update 2020-002 - reboot on sleep

The suggestion to prevent sleep was intended more as a potential work around for anyone else reading this thread who might be experiencing the same problem. I agree with your original assessment that this appears to be firmware related (BridgeOS). You could try reviving the firmware if you believe that the issue is related to a corruption during update but I personally think we're both out of luck until Apple chooses to address this in a future update.

I have had the same problem with similar equipment, Drew - it's been a bother for months!

As a work-around, I keep Opera open on two pages - which stops the reboot happening - all I need do after the unit comes out of sleep is acknowledge that Opera stopped the rebooting.

I find it really, really, annoying that this problem has not been fixed - I see others have had it over the years, Drew.

Ron

Thanks for the update, Drew - I updated from earlier OS to Catalina yesterday - and it's still trying to reboot when asleep - Opera and Parallels both stop it from happening. And it's still frustrating.

I'm running a similar configuration to you and am experiencing the same thing. In addition to crashing when put the machine to sleep it also reports a kernel panic when I perform a shutdown and restart. The crash report seems to indicate that this could be an issue with BridgeOS.

As you indicated, not sure reinstalling MacOS will resolve this as this seems to be related to firmware. Might just have to wait until Apple addresses this... hopefully in a supplemental update.

Also, as an alternative to using Parallels or Opera to prevent sleep you can just use caffeinate from the terminal.

It seems the new Safari 13.1 triggers those crashes:

Reboot, login, open & close the current Safari 13.1 in 10.14.6. Then put the Mac mini 2018 to sleep. It crashes and reboots after about 2 minutes.

If I don't open Safari, the Mac sleeps OK. Also a cold boot does not issue a crash report then. If I have used Safari and shutdown, then after a cold boot there is a crash report.

I could repeat that many times on many user accounts and also on an external disk.

Maybe my Catalina-induced (10.15.4 update) recent firmware update to Boot ROM Version: 1037.100.359.0.0 (iBridge: 17.16.14263.0.0,0) is the culprit after all:

I re-tested on a cleanly installed Mojave 10.14.6 with Safari 12.1.2 (without the recent Security Update 2020-002 Mojave or Safari 13.0.5 & 13.1 updates). Also then just using Safari 12.1.2 and then putting the Mac mini to sleep caused a crash (maybe also some other activity besides using Safari can trigger the crash?).

Please post the results, Drew, if Apple works on your computer.

The closest Apple operated service centre is 2 hours away from me, not terribly convenient.

An update on my situation, since updating to Catalina, Opera doesn't always stop the reboot in sleep, whereas it always did in the earlier OS.

Another thing I find frustrating with Catalina - just as I am typing in my login password, both monitors go black for a while. After they come back all works normally until the next reboot, whenever that comes along in sleep mode.

Ron

That's frustrating. Unless you received a new Motherboard or your T2 firmware was somehow downgraded I do not think your problem was solved in the first place. It problably did not happen simply because you did not leave your Mac Mini in sleep before doing the TM restore.

I have the same problem so we're all in the same boat here but to prevent misinformation being spread I gotta chime in here for a second. Unlike what many on here seem to think: it is not triggered by Safari. I have not been using Safari for one week and the crash is still happening. I've also been running the Mac Mini with Mojave 10.14.6 on it without installing security update 0.2 and the problem is still there. I've even done a DFU mode restore on the Mac Mini and now my T2 chip has the very latest firmware: ''17P4281'' and the problem keeps persisting.

Updating to Catalina on my machine made the problem more prevalent, and in addition, added a blanking of both screens about 10 seconds after waking up. Still, most of the time Opera will keep the machine from rebooting.

I did spend a long time on the phone with an Apple tech - up until he advised the next step was to re-install the OS. I am leery of doing so - even though I have backups of my machine. I cannot stand the thought of any down time, now that I don't have a laptop, and this Mac Mini is my only computer other than phones and iPads.

I am also on 10.15.4, Drew - I don't recall if I've done one update since going to Catalina, or not. It's not on auto-update.

The tech on the phone said re-installing the OS only did that, everything else stayed the same. I have an older Mac Mini here, I may try it on that first..... just to reassure myself. I'm a tech myself, perhaps that's why I'm leery. <g>

Thanks for your inputs!

Ron in Noosa

Re-installing Mojave does not help. The sleep problem is there even before applying the latest Mojave security update (or Safari 13.05 or 13.1 update) that triggered this problem via AFAIK its FW update. It is depressing the Apple support does not know that (I have sent them error reports about this over a month ago but obviously that info is not spread out to regular support staff).